ChemistryApproximately what percentage of the universe is believed to consist of hydrogen?  

Approximately what percentage of the universe is believed to consist of hydrogen?  


  1. A
    25%   
  2. B
    50%   
  3. C
    75%   
  4. D
    90% 

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    Solution:

    Hydrogen is a one-proton, one-electron element that is normally found in the form of a gas. Hydrogen was produced in the Big Bang and is the most abundant element in the universe, accounting for around 75% of all normal matter. Helium is an element with a nucleus of two protons and two neutrons surrounded by two electrons that is normally found as a gas. Helium is the second most plentiful element in the universe, behind hydrogen, accounting for nearly a quarter of all atoms.
      
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